Southern California Hypocenter Relocation with Waveform Cross-Correlation, Part 1: Results Using the Double-Difference Method

Hauksson, Egill; Shearer, Peter M.

doi:10.1785/0120040167

Cited by 144 publications

(132 citation statements)

References 37 publications

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“…First, we applied both 1D and 3D velocity models from Hauksson (2000) to improve the SCSN catalog locations using the methods of Klein (2002) and Thurber (1993). Second, we applied an approach similar to that of Hauksson and Shearer (2005), Shearer et al (2005), and Lin et al (2007) by clustering the events and using the differential travel times to perform relative relocations within each cluster. The resulting catalog, HYS_catalog_2011, contains more than 502,000 earthquakes, including 386,277 events that were relocated using differential travel times.…”

Section: Introductionmentioning

confidence: 99%

Waveform Relocated Earthquake Catalog for Southern California (1981 to June 2011)

Hauksson¹,

Yang²,

Shearer³

2012

Bulletin of the Seismological Society of America

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We determine a new relocated catalog, HYS_catalog_2011, for southern California from 1981 through June 2011. About 75.3% of the hypocenters are calculated with absolute and differential travel-time picks, and 24.7% could be relocated only by using absolute travel-time picks with 3D or 1D velocity models. The total catalog consists of more than 502,000 earthquakes in the region extending from Baja California in the south to Coalinga and Owens Valley in the north. The catalog consists of three M 7.1, M 7.2, and M 7.3 mainshocks; their foreshocks and aftershocks; and background seismicity caused by tectonic and other processes in the southern California crust. Hypocenters in the new relocated catalog exhibit tighter spatial clustering of seismicity than does the routinely generated catalog, and the depth distribution is tighter and reflects the thickness of the seismogenic zone more accurately. Compared to the standard catalog, the relocated hypocenters are more easily related to other data sets, such as mapped late Quaternary faults.

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Section: Introductionmentioning

confidence: 99%

Waveform Relocated Earthquake Catalog for Southern California (1981 to June 2011)

Hauksson¹,

Yang²,

Shearer³

2012

Bulletin of the Seismological Society of America

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405

511

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“…Much of the history of research in the literature seems to have focused primarily on improving locations (Poupinet et al, 1984;Fréchet, 1985;Ito, 1985;Frémont and Malone, 1987;Deichmann and Garcia-Fernandez, 1992;Got et al, 1994;Dodge et al, 1995;Nadeau et al, 1995;Shearer, 1997;Lees, 1998;Rubin et al, 1999;Waldhauser et al, 1999;Waldhauser and Ellsworth, 2000;Phillips, 2000;Rowe et al, 2002;Schaff et al, 2002;Moriya et al, 2003;Shearer et al, 2005;Hauksson and Shearer, 2005). Using waveform cross correlation for detection has been studied less.…”

Section: Introductionmentioning

confidence: 99%

Improving Magnitude Detection Thresholds Using Multi-Station Multi-Event, and Multi-Phase Methods

Schaff¹,

Waldhauser²

2008

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. (31-07-2008) REPORT DATE SPONSOR/MONITOR'S ACRONYM(S)AFRL/RVBYE SPONSOR/MONITOR'S REPORT NUMBER(S) AFRL-RV-HA-TR-2008-1121 DISTRIBUTION / AVAILABILITY STATEMENTApproved for Public Release; Distribution Unlimited. SUPPLEMENTARY NOTES ABSTRACTWe report on the results of both a semi-empirical analysis and a case study in Xiuyan, China, that demonstrated that a correlation detector can lower magnitude detection thresholds by over one full unit for similar events as compared to a standard STA/LTA detector. 90 out of 90 events (100%) were detected by cross correlation for the case study whereas a procedure like the pIDC employs detected only 11%. We found that less than perfect matches still provided useful detections due to location, focal mechanism, and magnitude differences. Events with magnitude differences as large as 2.3 and 3.3 were shown to produce detection spikes on the correlation traces. Further work applied the correlation techniques on a larger scale to 5,000 events at Parkfield, California, and 19,000 events in and near China. We are attempting to see how broadly applicable correlation methods can be applied to different tectonic settings and for what percentage of the seismicity. 111 million correlations were performed on Lg-waves for the events in China at 363 stations. Final results indicate two thirds of the 19,000 events can be detected by cross correlation using this relatively sparse regional network. The full magnitude unit reduction in detection threshold is confirmed on a large scale in China and Parkfield.

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“…9a). However, given the poor ray path coverage in this region, depths are not well resolved (Hauksson and Shearer, 2005).…”

Section: The 1872 Rupture: Seismological Observationsmentioning

confidence: 99%

“…SCSN events are located using a standard 1D model that is heavily constrained by paths through the Mojave. The Hauksson and Shearer (2005) hypocenters are located with an iterative process, whereby initial locations are determined with the 3D models of Hauksson (2000) and then a 1D model is used in a doubledifference algorithm to obtain precise relative locations. The 3D model of Hauksson (2000) has generally higher velocities in the Owens Valley region than the standard 1D SCSN model, Again, however, ray path coverage is limited because this region is at the edge of the inversion area.…”

Section: The 1872 Rupture: Seismological Observationsmentioning

confidence: 99%

“…Based on the investigations of BC94 and Vittori et al (2003), we infer a plausible range of rupture lengths to be 120-140 km. Considering the relocated hypocenters of Hauksson and Shearer (2005) we infer a range of rupture widths to be 15-25 km, assuming the rupture broke the full extent of the seismogenic zone. Using the average slip (6 2 m) inferred by BC94, the rupture dimensions imply M w 7.5-7.9.…”

Section: The 1872 Rupture: Seismological Observationsmentioning

confidence: 99%

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Revisiting the 1872 Owens Valley, California, Earthquake

Hough

Hutton

2008

Bulletin of the Seismological Society of America

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The 26 March 1872 Owens Valley earthquake is among the largest historical earthquakes in California. The felt area and maximum fault displacements have long been regarded as comparable to, if not greater than, those of the great San Andreas fault earthquakes of 1857 and 1906, but mapped surface ruptures of the latter two events were 2-3 times longer than that inferred for the 1872 rupture. The preferred magnitude estimate of the Owens Valley earthquake has thus been 7.4, based largely on the geological evidence. Reinterpreting macroseismic accounts of the Owens Valley earthquake, we infer generally lower intensity values than those estimated in earlier studies. Nonetheless, as recognized in the early twentieth century, the effects of this earthquake were still generally more dramatic at regional distances than the macroseismic effects from the 1906 earthquake, with light damage to masonry buildings at (nearest-fault) distances as large as 400 km. Macroseismic observations thus suggest a magnitude greater than that of the 1906 San Francisco earthquake, which appears to be at odds with geological observations. However, while the mapped rupture length of the Owens Valley earthquake is relatively low, the average slip was high. The surface rupture was also complex and extended over multiple fault segments. It was first mapped in detail over a century after the earthquake occurred, and recent evidence suggests it might have been longer than earlier studies indicated. Our preferred magnitude estimate is M w 7.8-7.9, values that we show are consistent with the geological observations. The results of our study suggest that either the Owens Valley earthquake was larger than the 1906 San Francisco earthquake or that, by virtue of source properties and/or propagation effects, it produced systematically higher ground motions at regional distances. The latter possibility implies that some large earthquakes in California will generate significantly larger ground motions than San Andreas fault events of comparable magnitude.

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Southern California Hypocenter Relocation with Waveform Cross-Correlation, Part 1: Results Using the Double-Difference Method

Cited by 144 publications

References 37 publications

Waveform Relocated Earthquake Catalog for Southern California (1981 to June 2011)

Waveform Relocated Earthquake Catalog for Southern California (1981 to June 2011)

Improving Magnitude Detection Thresholds Using Multi-Station Multi-Event, and Multi-Phase Methods

Revisiting the 1872 Owens Valley, California, Earthquake

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